diff --git a/28/fpm-alpine/Dockerfile b/28/fpm-alpine/Dockerfile
index 02cd4a23..63569f89 100644
--- a/28/fpm-alpine/Dockerfile
+++ b/28/fpm-alpine/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-alpine.template
-FROM php:8.2-fpm-alpine3.20
+FROM php:8.2-fpm-alpine3.21
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/29/fpm-alpine/Dockerfile b/29/fpm-alpine/Dockerfile
index 4e147a5c..6e4ea4d1 100644
--- a/29/fpm-alpine/Dockerfile
+++ b/29/fpm-alpine/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-alpine.template
-FROM php:8.2-fpm-alpine3.20
+FROM php:8.2-fpm-alpine3.21
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/30/fpm-alpine/Dockerfile b/30/fpm-alpine/Dockerfile
index 52ea716c..9bd77015 100644
--- a/30/fpm-alpine/Dockerfile
+++ b/30/fpm-alpine/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-alpine.template
-FROM php:8.2-fpm-alpine3.20
+FROM php:8.2-fpm-alpine3.21
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/update.sh b/update.sh
index 6e576238..ff042751 100755
--- a/update.sh
+++ b/update.sh
@@ -2,7 +2,7 @@
 set -eo pipefail
 
 declare -A alpine_version=(
-	[default]='3.20'
+	[default]='3.21'
 )
 
 declare -A debian_version=(
@@ -27,8 +27,8 @@ declare -A base=(
 
 declare -A extras=(
 	[apache]='\nRUN a2enmod headers rewrite remoteip ; \\\n    { \\\n     echo '\''RemoteIPHeader X-Real-IP'\''; \\\n     echo '\''RemoteIPInternalProxy 10.0.0.0/8'\''; \\\n     echo '\''RemoteIPInternalProxy 172.16.0.0/12'\''; \\\n     echo '\''RemoteIPInternalProxy 192.168.0.0/16'\''; \\\n    } > /etc/apache2/conf-available/remoteip.conf; \\\n    a2enconf remoteip\n\n# set apache config LimitRequestBody\nENV APACHE_BODY_LIMIT 1073741824\nRUN { \\\n     echo '\''LimitRequestBody ${APACHE_BODY_LIMIT}'\''; \\\n    } > /etc/apache2/conf-available/apache-limits.conf; \\\n    a2enconf apache-limits'
-	[fpm]=''
-	[fpm-alpine]=''
+	[fpm]='\nENV PHP_PM_MAX_CHILDREN 16\nRUN {\\\n     echo'\''pm = pm=dynamic'\''; \\\n     echo'\''pm.start_servers = 4'\''; \\\n     echo'\''pm.min_spare_servers = 2'\''; \\\n     echo'\''pm.max_spare_servers = 24'\''; \\\n     echo'\''pm.max_children = ${PHP_PM_MAX_CHILDREN}'\''; \\\n    } > "${PHP_FPM_DIR}/nextcloud.conf";\n'
+	[fpm-alpine]='\nENV PHP_PM_MAX_CHILDREN 16\nRUN {\\\n     echo'\''pm = pm=dynamic'\''; \\\n     echo'\''pm.start_servers = 4'\''; \\\n     echo'\''pm.min_spare_servers = 2'\''; \\\n     echo'\''pm.max_spare_servers = 24'\''; \\\n     echo'\''pm.max_children = ${PHP_PM_MAX_CHILDREN}'\''; \\\n    } > "${PHP_FPM_DIR}/nextcloud.conf";\n'
 )
 
 declare -A crontab_int=(
diff --git a/versions.json b/versions.json
index ec8b3ca9..09f25557 100644
--- a/versions.json
+++ b/versions.json
@@ -20,7 +20,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.20",
+        "baseVersion": "3.21",
         "phpVersion": "8.2"
       }
     }
@@ -46,7 +46,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.20",
+        "baseVersion": "3.21",
         "phpVersion": "8.2"
       }
     }
@@ -72,7 +72,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.20",
+        "baseVersion": "3.21",
         "phpVersion": "8.2"
       }
     }